Molding device for concrete piles



May 31, 1932. R. TADA MOLDING' DEVICE FOR CONCRETE PILES Filed OCT.. '7, 1929 H gaffe Cgi Patented May 31, 1932 UNITED STA-'TES PATENT (JYFFICEv YRENZO irene, oF ToYoTAiviA GUN,

TOKYO FU, JAPAN, ASSGNOR TO TOYO COMPRESSOL KABUSHIKI KAISHA (THE GRIENTAL'COMPRESSOL CO. LTD.) OF TOKYO, JAPAN, A

CORPORATON` F JAPAN f MonniNG nnvrcn non CONCRETE PILES Applieationfled October 7, 1925. Serial No. 338.070.

'The present invention relates to an improvementy inv-a 'molding device for concrete piles and the lilre'comprising a hollow tamping rod adapted to'receive a charge 0f con-y crete, the hollowrod having a movable secvtion'at the lower end thereof adapted to be operated to release and'emptythe concrete into the pile cavity.

' The objectof this invention is to obtain a moldingdevice' vfor concrete piles simple in construction and easy to operate, characterized in that the inner tube serves 'as a tampingrod and concretecan be easily supplied te the pile hole by firstiilling theinner tube with the concrete and then causing the movable partat the lowerend ofthe inner tube 'to yslide'. According to the past experience,

the bottom of theinnertube is apt to be damaged by the force 'required in the first tamping.y Now, according Yto this 'invention such drawback is removed by'tting a` removable y reinforcing .ca-p to the bottom of the inner tube in they first tamping only.y

Referring to the accompanying drawings,

Fig. l shows a longitudinal sectional view of this device producing the end of a pile, which expands around it, by tamping the first chargeof concrete;

Fig. 2, a cross section of the same;

Fig. 3, a sectional View in which the rein forcing cap has been removed from the lower end of the inner pipe after the operation as illustrated in Fig. l and the second charge Yof'concrete has been supplied to the inner pipe;V

Fig. 4, a cross section of the same;

Fig. 5, a cross section showing a modilication of the Xed and movable parts of the inner tube, and

Fig. 6, a longitudinal sectional view'showing the above charge of concrete discharged from the bottom of the movable part into the pile hole by the sliding down of the movable part.

In the drawing, l is the outer tube to be driven into the earth, 2 the inner tube which serves as a tamping rod and the lower end of which is divided into two parts as shown at 3 and 4. It is preferable to construct the part 3 so that it is thicker thanthe. tube itthereinto.

self and the inner surface of its lower end tube into two parts and is provided with a thin part 5 formed by cutting away the outer well of its upper part. This reduced part is inserted in the inner tube 2, so that it can slide along the inner surface of the inner tube 2 and the abutting surface of the part 3. lf the lmovable part 4 is lifted with a suitable rope l0 till its shoulder 6 comes into Contact with an abutting end surface 7, the parts 3 and 4 will meet and form a closed tubular vessel, so that if the part 4 is lowered by slacking the rope 10, the concrete contained in the closed vessel will be Vdischargedinto the pile hole as shown in Figure 5. 3 and 4 may be formed as shown iny Figure 6 instead of Figure 4. That is to say, instead of forming the part 3 thick a guide member 8 may be attached to its either side so as tok guide the part 4. l1 is a reinforcing cap to be fitted 'over the bottom end ofthe closed vessel comcures the rod ll in place and is arranged in s Vsuch a manner that it can ybe easily xed or detached.

rlhe operation of the device according to the invention is as follows:

Drive into the earth the outer tube l provided with tllieshoe l5 and pour concrete T e 3 to',l form a closed vessel and they reinforcing' cap ll is fitted on the closed vessel andthe inner tube is inserted into the outer tube.

Then, tamp the concrete by moving said in* ner tube up and down, and the shoe will part 4 is made to meet part j be detached from the` outer tube and the concretewill expand in the earth asshown Y p in Figure l.

After the first operation mentioned above, draw out the inner tube 2 together with the reinforcing cap ll from the outer tube, take out the rod 13 by turning the set screw 14 and remove said cap, after which theinner tube 2 is again inserted into the outer tube l and -thenis iilled with the second charge of adapted to receive a charge of concrete,

Aa cap concrete (Figure Next, allow the movable part 4r to slide down by slacking the rope 10, and the concrete will fiow down from the inner tube into the pile hole. Pull the rope 10 to make the parts 3 and 4 meet and draw out the outer tube gradually, tampi'ng the concrete with its bottom. Then, it will be possible to produce another knob on the yconcrete root made by the first operation. y

If the same operation with the second one vis repeated several times, a pile having a number of the knobs or enlargements along its whole length can be obtained.

As explained above, the device according to this invention is very simple in construction and easy to operate. Moreover, as the reinforcing cap is used in the first heavy operation, the bottom end, namely the tamping end of the inner tube, is not damaged.

Claims:

1. A molding device for concrete piles or the like, comprising a hollow ta-mping rod adapted to receive a charge of concrete, said hollow rod having its lower end divided longitudinally providing a movable section at the lower end thereof adapted to be operated to release the concrete into the pile cavity.

crete, said tubular member having an openingy in the wall thereof at the lower end, and a movable member closing said opening and adapted to be moved to provide a laterally openingy discharge orifice at the lower end of the tubular member for the release of the concrete.

3. A molding device for concrete piles, including an inner tube, the lower portion of the inner tube being adapted to be used as a camping rod and having its lower end divided longitudinally into two sections, one

`f section being slidable along the other so that concrete can be supplied from the bottom of the tube into the hole of the pile.

4. A molding device for concrete piles, .including an inner tube, the lower end of the I inner tube being constituted by two parts armnged side by side. one of which is integral with said tube and the other slidable along the said part so that the concrete can be supplied from the bottom of the tube into the pile hole, the lower ends of thetwo parts constituting a camping member.

5. A molding device for concrete piles or thelike, comprising a hollow tamping rod said hollow rod having a movable section at the lower end thereof adapted to be operated to release the concrete into the pile cavity, and

member adapted to be detachably se- 2 cured to the lower end ofsaid hollow rody and the movable section to protect and reinforce the same during the tamping operation.

6. A device as claimed in claim 5, characterized in that the lower end of the tubular member has its walls thickened to reinforce the same.

7. A molding device for concrete piles, includi'ng an inner tube, the lower portion of the inner tube being adapted to be used as a tamping rod and being composed of two sections, one section being slidable along the other so that concrete can be supplied from the bottom of the tube into the hole of the pile, a cap adapted to be fitted over the lower extremity of said tube sections to protect and reinforce the same, and means for detachably securing said cap in place.

8. A device as claimed in claim 5, wherein the lower end of the hollow rod presents a tapered surface and the cap member is co1'- respondingly tapered.

9. A device as claimed iu claim 5, wherein the cap carries an annular flange which encircles the wall of the hollow rod and a fastening pin extending through the cap flange and tube.

10. A molding device for concrete piles and the like, comprising a hollow tamping rod adapted to receive a charge of concrete and having a closed lower end, said rod including a body part having the lower end thereof cut away and a relatively movable part telescopically fitted in the cut away portion of the body part and normally occupying a position with respect thereto to form a tamping implement, said movable y art having an external shoulder engageal le with the body part to limit the upward movement of the movable part and permit the latter to move downwardly with relation to the body part so as to permit of the discharge of material contained in the rod.

In testimony whereof I have affixed my signature.

RENZO TADA.

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